private void addAsArrayElement(ObjectTypePair elementTypePair) {
if (elementTypePair.getObject() == null) {
root.getAsJsonArray().add(JsonNull.createJsonNull());
} else {
JsonElement childElement = getJsonElementForChild(elementTypePair);
root.getAsJsonArray().add(childElement);
}
}
public void visitArrayField(FieldAttributes f, Type typeOfF, Object obj) {
try {
if (isFieldNull(f, obj)) {
if (serializeNulls) {
addChildAsElement(f, JsonNull.createJsonNull());
}
} else {
Object array = getFieldValue(f, obj);
addAsChildOfObject(f, new ObjectTypePair(array, typeOfF, false));
}
} catch (CircularReferenceException e) {
throw e.createDetailedException(f);
}
}
/** objTypePair.getObject() must not be null */
@SuppressWarnings({"unchecked", "rawtypes"})
private JsonElement findAndInvokeCustomSerializer(ObjectTypePair objTypePair) {
Pair<JsonSerializer<?>, ObjectTypePair> pair = objTypePair.getMatchingHandler(serializers);
if (pair == null) {
return null;
}
JsonSerializer serializer = pair.first;
objTypePair = pair.second;
start(objTypePair);
try {
JsonElement element =
serializer.serialize(objTypePair.getObject(), objTypePair.getType(), context);
return element == null ? JsonNull.createJsonNull() : element;
} finally {
end(objTypePair);
}
}
public void visitObjectField(FieldAttributes f, Type typeOfF, Object obj) {
try {
if (isFieldNull(f, obj)) {
if (serializeNulls) {
addChildAsElement(f, JsonNull.createJsonNull());
}
} else {
Object fieldValue = getFieldValue(f, obj);
// we should not get more specific component type yet since it is
// possible that a custom
// serializer is registered for the componentType
addAsChildOfObject(f, new ObjectTypePair(fieldValue, typeOfF, false));
}
} catch (CircularReferenceException e) {
throw e.createDetailedException(f);
}
}
public boolean visitUsingCustomHandler(ObjectTypePair objTypePair) {
try {
Object obj = objTypePair.getObject();
if (obj == null) {
if (serializeNulls) {
assignToRoot(JsonNull.createJsonNull());
}
return true;
}
JsonElement element = findAndInvokeCustomSerializer(objTypePair);
if (element != null) {
assignToRoot(element);
return true;
}
return false;
} catch (CircularReferenceException e) {
throw e.createDetailedException(null);
}
}
public boolean visitFieldUsingCustomHandler(
FieldAttributes f, Type declaredTypeOfField, Object parent) {
try {
Preconditions.checkState(root.isJsonObject());
Object obj = f.get(parent);
if (obj == null) {
if (serializeNulls) {
addChildAsElement(f, JsonNull.createJsonNull());
}
return true;
}
ObjectTypePair objTypePair = new ObjectTypePair(obj, declaredTypeOfField, false);
JsonElement child = findAndInvokeCustomSerializer(objTypePair);
if (child != null) {
addChildAsElement(f, child);
return true;
}
return false;
} catch (IllegalAccessException e) {
throw new RuntimeException();
} catch (CircularReferenceException e) {
throw e.createDetailedException(f);
}
}
public void visitPrimitive(Object obj) {
JsonElement json = obj == null ? JsonNull.createJsonNull() : new JsonPrimitive(obj);
assignToRoot(json);
}
@Override
public void visit(JsonNull value) {
out.append(value.toString());
}